postgresql@.service, postgresql-generator: Upgrade postgresql dependency to Required from Wanted.

debian/changelog

@@ -19,6 +19,8 @@ postgresql-common (171) UNRELEASED; urgency=medium
     Trying to start already running clusters clusters will return 0 now
     (was 2 in the native implementation).
   * pg_createcluster, pg_renamecluster: Warn on cluster names with dashes.
+  * postgresql@.service, postgresql-generator: Upgrade postgresql dependency
+    to Required from Wanted.
 
   [ Martin Pitt ]
   * pg_upgradecluster: Fix "ANALZYE" typo.

systemd/postgresql-generator

@@ -7,10 +7,10 @@
 set -eu
 
 gendir="$1"
-wantdir="$1/postgresql.service.wants"
+requiredir="$1/postgresql.service.requires"
 pgservice="/lib/systemd/system/postgresql@.service"
 
-mkdir -p "$wantdir"
+mkdir -p "$requiredir"
 
 for conf in /etc/postgresql/*/*/postgresql.conf; do
 	test -e "$conf" || continue
@@ -27,7 +27,7 @@ for conf in /etc/postgresql/*/*/postgresql.conf; do
 	verdir="${dir%/*}"
 	version="${verdir##*/}"
 	cluster="${dir##*/}"
-	ln -s "$pgservice" "$wantdir/postgresql@$version-$cluster.service"
+	ln -s "$pgservice" "$requiredir/postgresql@$version-$cluster.service"
 done
 
 exit 0

systemd/postgresql@.service

@@ -30,4 +30,4 @@ OOMScoreAdjust=-900
 #RestartPreventExitStatus=SIGINT SIGTERM
 
 [Install]
-WantedBy=multi-user.target
+RequiredBy=multi-user.target